Power driven riser and pouring sprue cutter



W. KOSS Nov. 29, 1955 POWER DRIVEN RISER AND POURING SPRUE CUTTER 2 Sheets-Sheet 2 Filed March 11, 1952 I N VEN TOR.

ATTD RN EYS POWER DRIVEN RISER AND POURING RUEv C ER.

Walter/Kass, Lakewood, Ohio Application March 11, 1952, Serial No. 276,013

2 Claims. 01. 22-38) This invention relates to devices for forming funnel shaped openings or counterbores in the upper ends of risers extended through sand in core boxes and other forms for casting and in particular a frusto-conical shaped cutter head having a single blade rotatably mounted on the lower end of a tubular pipe member and actuated with an air motor extended from the head.

The purposeof this invention is to provide means whereby conical shaped openings may readily be formed by mechanical means in the upper ends of risers of the cope of form boxes and the like.

To facilitate pouring hot metal through risers to cavities formed by patterns orflasks in sand in form boxes and the like the upper ends of the risers are enlarged with wood blocks and other means and in the conventional-method sand drops through the risers into the cavities. With this thought in mind this invention contemplates a machine for rapidly forming funnel shaped openings in the upper ends of risers whereby the sand cut from the form is blown through the riser so thatit may be blown through the cope withair under pressure after the pouring opening is formed.

The object of this invention is, therefore, to provide a conical shaped cutter head in which an open area is provided in the interior thereof through which air blows from a riser through the riser and-cope.

Another object of the invention is to provide a riser cutter that is adapted to be rotated with a motor carried by a tubular pipe member extended from the cutter head.

A further object of the invention is to provide a substantially hollow conical shaped cutter head for forming funnel like openings in the upper ends, of risers of form boxes in which means is provided for blowing sand through the cope and from the head, which is of a simple and economical construction.

With these and other objects and advantages in view the invention embodies a frustro conicalshapedshell having. an elongated slot in one side mounted on the lower end of a tubular pipe member witha cutting blade mounted in the shell and'extended through the slot and with a motor mounted on the tubular pipe member and positioned to rotate the shell with the cutter blade therein.

Other features and advantages. of the invention will appear from the following description taken in connection with the drawings, wherein:

Figure l is an elevational view illustrating the complete assembly of the power actuated riser cutter, showing the cutter head mounted on the lower end of a tubular pipe member and also showing an air motor mounted on the shaft and positioned to rotate the cutter head.

Figure 2 is a detail illustrating a Y-connection in a compressed air supply tube whereby the air is supplied to the air motor for rotating the cutter head and also to the interior of the cutter head for ejecting sand from the head and riser.

Figure 3 is a longitudinal section through the motor shown in Fig. 1 and on the line 3--3 with other parts omitted.

2 Figure 4 is a detailed-sectional view on the line of 4-4 of Fig. 1 illustratingthe control valve by which compressed air is admitted to; the interior or the shell of the cutter head.

Figure S'is a vertical section through the cutter headtaken on line 5-5 of Fig. 7 with the parts shown on an enlarged scale, with the shell rotated to a position degrees from the position shown in Fig. 1.

Figure 6 is a cross section through the shell of the cutter head taken on -line 6 6 of Fig. 5.

Figure 7: is a similar section taken on line 77 of Fig. 5.

Figure 8 is a detail illustrating a section through one side of the. shell taken on line 8-8 of Fig. 5 showing thek-nife extendedthrough the slot in the wall.

Figure 9 is a planview of a form box with some of the risersshown straight and with some shown with enlarged upper ends,

Figure 10 is a side elevational view of the box shown in Fig. 9 with parts broken away showing the riser cutter in the upperendof one ofthe risers thereof.

Referring now to the drawings wherein like reference characters denote corresponding parts the power driven riser cutter of this invention includes a shell 10 having a cutting blade 11extendedthrough a slot 12 therein, a tubular pipe member-1 3 on thelower end of which the shell is journaled and a fluid actuated motor 14 mounted on a second tubular pipe member that is parallel to the tubular pipe member 13 and having a pinion 16 on a spindle 1=7-that meshes with an idler pinion 7 journaled on a stub shaft 8. The pinion '7 meshes with a gear 18 in a stationary housing 10 which is fixedly mounted on the lower end of the tubular pipe member 13 and that provides a head of the cutter.

The shell 10; is frustr o-conical shaped having an open lower end 20 and a cylindrical section 21 extended from the upperend and which. is secured to a base 22 byscrews 23. The base 22 is secured to a disc 23a, which is integral withthe gear 18, by screws 24 and the screws 24 also extend through a flange 25; of a case 26 which is provided with perforations 2-7 and through which air from the tubular pipe. member 13. is discharged into the interior of the shell 10. The case 26 is also provided with a neck 28 and centrally-disposedopening 29 extends through the neck.

A ball bearing 30; which is clamped between the base 22 and d-isc23 by't-he screws 24 is mounted on a bushing 31 which is threaded on the lower end of the tubular pipe member 13 and which is providedwith a flange 32, upon which the ball bearing is positioned. A bearing sleeve 33 is also provided between the gear 18 and the bushing 31, and a lock nut 34 is positioned against the outer surface of the stationary housing 19.-

The spindle 17 extends through the upper end of the stationary housing 19 and a ball bearing 35, which is mounted onthe spindle. and positioned in cup shaped housing 36 providesmeans for journaling the spindle in the housing. Theupper end-of the casing 36 is provided with a sealing.disc 3 7r The spindle 17 extends into the chuck 38 of the air motor 14.

The motor 14 is formed as illustrated in Fig. 3 wherein the spirally grooved rotor 39 is journaled in the housing with a shaft 40 with bearings 41 and 42 and, as illustrated in Fig. 3, the air from the pipe member 15 is discharged into the grooves of the rotor through a passage 43 which extends through a valve 44 in a core 45 extended through the pump housing 46. The valve 44 is retained in the closed position with a spring 47 that extends into a plug 48 threaded into the housing and the valve is opened by a button 49 that is slidably mounted in the housing and that is positioned to engage a valve stem 50 extended from the valve 44.

The pipe member 15 is threaded into a threaded nipple 51 on the upper end of the housing 46 and the parts are secured in assembled relation with lock nuts 52. The pipe member 15 and also the tubular pipe member 53 which extends from the tubular pipe member 13 are connected with a bracket 54 the upper ends at which are connected to a supply tube 55 with a Y-fitting 56 having coupling elements 57 and 58 in the lower ends thereof which are connected to the pipe members 15 and 53, respectively.

The tubular pipe member 13 is provided with an enlarged section 60 having a valve 61 therein and the valve is resiliently held against the seat 62 with a spring 63 that is positioned in a recess in a plug 64 threaded in one side of the enlarged section 60. The valve is opened by a button 65 on a stem 66 extended from the opposite side of the enlarged section. With the valve arranged in this manner air is admitted from the supply tube 55 through the branch of the Y-fitting 56 to the pipe member 53 and from this pipe member to the tubular pipe member 13 that opens into the interior of the shell through the case 26.

The valve 61 is opened as air is supplied to the motor 14 whereby as the blade 11 shaves the sand from the sand around the risers in the cope a blast of air through the shell forces the sand through the riser so that the shell remains substantially clean.

After use any sand remaining in the shell may be blown out by opening the valve 61. By this means the upper ends of risers of core and form boxes are readily counterbored or reamed out to provide a funnel like opening in the upper end of the riser whereby metal may readily be poured through the risers into the cavity provided by a pattern or the like.

The blade 11 may be of any suitable shape or design and may be mounted in the shell 10 by suitable means. In the design shown the blade is provided with slots 67 and 68 through which bolts 69 and 70 extend, as illustrated in Fig. 5. A guard plate 71 may be positioned over the ends of the bolts into which the bolts may be threaded as shown in Fig. 8.

In use the power actuated riser cutter of this invention may be held by hand so that the lower end is positioned in the upper end of a riser and by pressing upon the button 49 air is admitted to the motor 39 whereby the shell 10 of the cutter head is rotated through the gears and with the conical shaped shell 10 rotating the shell is inserted into the end of the riser with the blade 11 shaving sand and the like from the form as illustrated in Fig. 10. The rotation of the cutter head is controlled by the button 49 of the motor and as the opening is formed the sand is removed from the shell and blown from the interior of the riser and cope as hereinbefore described.

It will be understood that modifications may be made in the design and arrangement of the parts without departing from the spirit of the invention.

What is claimed is:

1. A form riser counterboring tool comprising a head having a depending frusto-conical shaped shell with a large end and a small end and having a longitudinally disposed slot in one side, a cutter blade removably mounted on the inner surface of the shell and extended through said slot, a first tubular pipe member mounted on and extended from the large end of said shell, means journalling the shell on the tubular pipe member, a spindle parallel to said tubular pipe member, means connecting said spindle to said shell for the rotation of said shell, means for rotating said spindle, a second tubular pipe member parallel to said first tubular pipe member and in line with said spindle and said rotating means includes a motor carried by said second tubular pipe member and connected to said spindle, means exhausting material from said shell, and the lower end of said first tubular pipe member communicates with the interior of the shell and said exhausting means includes a compressed air supply pipe that forces compressed air through said first tubular pipe member, and the rotating means for the spindle includes an air actuated motor carried by the second tubular pipe member and said spindle is geared to the shell, and said motor and said shell are provided with manually actuated valves.

2. In a form riser cutter, the combination which comprises a first tubular pipe member adapted to be connected, at one end, to means for supplying air under pressure, a spring loaded button actuated valve in said tubular pipe member, a head fixedly mounted on the lower end of the tubular pipe member, 2. depending frustro-conical shaped shell with a large upper end and a small lower end and having a longitudinally disposed slot in one side connected to and depending from said head, means journalling the shell in the head, a cutter blade mounted on the interior surface of the shell and extended through said slot, a second tubular pipe member parallel to said first tubular pipe member, a motor mounted on the second tubular pipe member, gears positioned in the head and connecting the motor to the shell whereby the shell is rotated by the motor, means whereby compressed air from the source of supply is provided to the motor, a button actuated spring loaded valve for controlling the supply of compressed air to the motor, a case having perforations therein mounted in the large end of the shell and said case is positioned with the interior thereof communicating with the interior of the first tubular pipe member whereby compressed air discharged through the case is ejected into the shell in small streams for removing loose material from said shell.

References Cited in the file of this patent UNITED STATES PATENTS 55,295 Holt June 5, 1866 235,191 Adams Dec. 7, 1880 1,282,963 Shroder Oct. 29, 1918 1,316,884 Fatscher Sept. 23, 1919 1,956,232 Thomas Apr. 24, 1934 2,069,669 Gill Feb. 2, 1937 2,114,111 Magnuson Apr. 12, 1938 2,272,868 Demkier et al Feb. 10, 1942 2,281,614 Organ May 5, 1942 2,283,491 Daley May 19, 1942 2,335,004 Garrison Nov. 23, 1943 2,532,634 Meunier Dec. 5, 1950 2,701,900 Johnston Feb. 15, 1955 

